Michael a



(No Model.)

M.l AIv W. LOUIS are. TQMURRMA- VENTILAIOR.

Y Ptented Jan.. 24, 1888.

IIIIIIIII IH E u; )I

l i I 4^ UNITED. STATES PATENT OFFICE.

MICHAEL A. w. lLOUIS AND CHARLES T. MURRAY, OE WASHINGTON,

f DISTRICT OE' COLUMBIA.

VEM'ILATOR)y l SPECIFICATION forming part of Letters Patent No. 376,827,dated January 24,1888. Application nien December' 12, 1ers. serial NOisasoi (No model.)

` To all whom it may concern.-

' the District of Columbia, have invented cer- Vaton of a window ha'vingvour invention ap-v v.as

tain new and useful Improvements in Ventilators; and we do herebydeclare that the following isa full, clear, and 'exact descriptionthereof. Y

Our invention relates to ventilators for win dows, and will be fullydescribed hereinafter.

yIn the drawings, Figure l'is an inside eleplied thereto. Fig. 2 is ahorizontal section taken above the meeting-railsy of the upper and lowersas'hes shown in Fig. l; and Figs. 3 to 1l, inclusive, are details ofmodifications.

A is the upper and B the lower sash. The

upper rail of the lower frame and the lowerrail of the upper frame are'Iliade with inclined coinciding slots or perforations b b', and on topof the upper rail of sash B is placed a perforated register plate, C,which may be secured thereto by'bolts a, passing throughslots therein,or'by any other deviceV .that will permit the plate C to move in thedirection of its length to open or Close the perforations. On its frontedge the plateC is provided with a ange, a', having an index, a2, andthe face of the rail beneath the flange and index is re-enforcedbyaplate,c, onwhich the words ()pen7 and Shut, or any other word ofcorresponding import, may bel displayed. The flange a. may extend alongthe entire length of the plate, as in Fig. 9, or may extend onlyashortdistance along its middle, as in Figs.` 1 and 2;

Y and the plate C may be bowed, as in Figs. 2

and 7, or may be straight, asin Fig..6, and slotted, as at d, to takethe sleeved screws 'that secure'the lock D in place.

In Fig. 3 the adjacent rails of the sashes are shown as perforated.

In Figs. 4 andA 5 the rail of sash A is beveled OIT, and in Fig. l1 bothsashes are beveled.

upper rail of sash B to receive the plate C and Re-enforce plates Elma/ybe placed upon the form a bearing for it, and we generally secure plateslike the one shown in Figs.. 8 and 10 (marked D) on the under Side ofSash B; but theselast may be dispensed with. I The :plate C may beeither perforated, asy shown in Figs. 2 and 6, or slotted, as in Fig. 7,and may slide longitudinally; or this plate may be without'slots, as inI4`ig..ll,'andA may move at right angles to its length, as in Fig. 11.In this modification a thumb-piece, c', might be provided to facilitateits operation.

Vhen the Openings through the sashes are entirely covered by the plateC, the air from without is oll course shut off, and the. amount we claimas new, and 4desire to secure by Letters Patent, is,-

The combination, with an y,upper and lower window-sash, of theirmeeting-rails provided with oblique perforatious registering with eachotherwheu the sashes are both closed, and a plate provided withopenings' registering with Said perforations in the meetingrails andadapted to slide longitudinally upon one of said rails to open or closethe said perforations.y i I In testimonyr that We claim the foregoing wehave hereunto set our hands,` at Vashingt'on, in the District ofColumbia, in the presenceof two witnesses.

M. A. W. LOUIS.

n CHAS. T. MURRAY.-

Witnesses:

S. S. STOUT, CHRISTINA CALLAN.

